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Being a reimagining of "Five", Classified's layout is mostly identical. However, like Blood of the Dead, the remake of Mob of the Dead, there are a few new rooms added to the map, including the Central Filing and Main Offices on the first floor, and the Server Room in the War Room. The Perk-a-Colas are replaced by the new perk system introduced in Black Ops 4. In addition to this, the steps taken to reach the Pack-a-Punch Machine have also changed. There are also several new Mystery Box locations as well, with the initial Mystery Box location being either in the Main Offices or on the upper level of the War Room.

The map also introduces two new buildables; the Riot Shield and the Teleporter Signal Amplifier, the latter being used to access the Pack-a-Punch Machine. With this modified teleporter, players are able to use the Pack-a-Punch Machine found in Groom Lake, the same place featured in the map Moon. The Electro-Shock Defenses return as well, although the locations for the parts needed to repair them are in different locations, with one spawning in the Server Room and the other spawning in the Porcine Research lab. The Winter's Howl also returns, and is obtainable from the Mystery Box and through completing the Project Skadi quest.

Unlike the original version, the Pentagon Thief is absent; he is instead replaced by the Hellhounds. Like the original map, the Crawler Zombies return, and can now spawn on other levels of the map instead of just the Laboratories. The Bonfire Sale power-up also returns, and can be acquired by opening up areas of Groom Lake, which is achieved by surviving in said area every few rounds without leaving or going down.

It is revealed that Ultimis were able to survive the aftermath of Moon, having been teleported to Groom Lake in 1963, where they were soon captured and experimented on by the US Government in Hangar 4 in Groom Lake.

It is also revealed that Ultimis Richtofen was able to regain his body after his zombified self interacted with his body in the hangar after completing his mission with his Primis version.

A jumpscare featuring an image of Primis Richtofen from the PlayStation 3 and Xbox 360 versions of Black Ops III can be found by aiming at a light on a building in the left-hand side of Groom Lake with a sniper rifle.

A memo on one of the podiums in the spawn room states that there was an outbreak within the Pentagon on October 18th and that anyone who was infected is being kept in the labs for study. It also references the upcoming meeting between JFK and Fidel Castro.

A formerly blacked out portrait of Primis Nikolai Belinski will appear in the Panic Room after knifing all crooked Presidential portraits in the Offices. This will cause the Ultimis Edward Richtofen portrait to fade to black.

If the door to the room in the Main Offices containing Robert McNamara is interacted with enough times, Samantha will yell "He said, leave him ALONE!" and a total of forty Nova Crawlers will spawn.

Unlike the original map, the windows within the laboratory will remain shut after the power is turned on, preventing players from jumping through them.